A group of protesters marched to the St. Louis County courthouse Tuesday to protest a police shooting that killed an unarmed black teenager. 

After two days of violence stemming from the incident, Tuesday's demonstration was peaceful, according to Reuters. 

The protesters are calling for justice in the death of Michael Brown. Brown, 18, was fatally shot in the back of a police car Saturday. Protesters claim that it is a tragic example of the harassment of black citizens by a mostly white police force in the city of Ferguson, Missouri. 

Tom Jackson, the police chief of Ferguson, said police tried to keep tensions to a minimum Tuesday. 

While authorities initially said that the name of the officer involved in the shooting would be released Tuesday, it has now been reported that his name will not be released out of concern for his safety. The race of the six-year veteran officer, who is now on administrative leave, has also not been disclosed. 

The FBI has begun a civil rights investigation into the shooting, which is also being investigated by St. Louis County. 

The protesters in Clayton, a town near Ferguson, chanted, "hands up, don't shoot," referencing reports that Brown appeared to have his hands up in surrender when he was shot. 

"We've consistently had a problem," said St. Louis attorney Jerryl Christmas, according to Reuters. "There's a lack of diversity all the way up from the local police to the prosecutor's office into the judiciary."

Police reports say Brown was involved in a struggle with a gun in the police car when he was killed, but did not say why he was in the car. At least one shot was fired, and police say the officer fired more shots before getting out of the car. 

"What I can tell you is it started out as a routine encounter with two young men walking on the street. They were asked to get on the sidewalk," Jackson said. "It quickly became a violent encounter and then became a fight, some kind of fight inside the car. Shots were fired. I don't know how many." 

The street where the killing took place, which is located in a low-income, predominantly black neighborhood, is now surrounded by memorial candles and flowers. 

"The police, they always look at us with a certain disdain," said neighborhood resident Christopher Phillips, 33. "So there are a lot of people with a 'F the police' mentality."

Benjamin Crump, the lawyer who is representing Brown's family, said the Justice Department should take over the investigation, not local police. 

"There were many, many witnesses who have talked to family members and they paint a very different picture than police witnesses," Crump said. Crump was also the legal representative for the family of Trayvon Martin, an unarmed black teen who was killed by neighborhood watch volunteer George Zimmerman in 2012. 

Brown's mother, Lesley McSpadden, said her son did not fight the officer. 

"Just because he's 6-foot (tall), black walking down the city street doesn't mean he fit the profile," McSpadden said.

More than 50 rioters have been arrested following Brown's death, mostly in the Ferguson suburb. While Brown's parents urged restraint, violence broke out Monday night, as police in riot gear tried to quell the protests. 

The area's demographic has shifted a great deal in the past few decades from mostly white to predominantly black. About two-thirds of the population of 21,000 in Ferguson is black, while three out of 53 officers are black. 

Dave Klinger, a former police officer and criminal justice professor at the University of Missouri-St. Louis, said that the race of officers should not matter, as long as they are professional and fair. 

"If the officer behaved inappropriately, we've got to sanction the officer and figure out what it is that led him to do what he did," Klinger said. 

He urged a transparent investigation. 

The investigation is ongoing. No further information has been released as of Tuesday afternoon.